The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 12, 2025
Filed:
Nov. 18, 2022
Osaka Gas Chemicals Co., Ltd., Osaka, JP;
OSAKA GAS CHEMICALS CO., LTD., Osaka, JP;
Abstract
A retardation film comprising: a first resin layer comprising resin A having negative intrinsic birefringence, wherein in-plane phase difference Ro(450) at an angle of incidence of 0° for light at a wavelength of 450 nm, in-plane phase difference Ro(550) at an angle of incidence of 0° for light at a wavelength of 550 nm, and in-plane phase difference Ro(650) at an angle of incidence of 0° for light at a wavelength of 650 nm meet Ro(450)>Ro(550)>Ro(650); and a second resin layer comprising resin B having positive intrinsic birefringence, wherein in-plane phase difference Ro(450) at an angle of incidence of 0° for light at a wavelength of 450 nm, in-plane phase difference Ro(550) at an angle of incidence of 0° for light at a wavelength of 550 nm, and in-plane phase difference Ro(650) at an angle of incidence of 0° for light at a wavelength of 650 nm meet Ro(450)>Ro(550)>Ro(650), the retardation film having a Nz coefficient of −1.0 to 1.0, wherein in-plane phase difference Ro(450) at an angle of incidence of 0° for light at a wavelength of 450 nm, in-plane phase difference Ro(550) at an angle of incidence of 0° for light at a wavelength of 550 nm, and in-plane phase difference Ro(650) at an angle of incidence of 0° for light at a wavelength of 650 nm meet Ro(450)<Ro(550)<Ro(650).